Quantum transducer with a color center in a 2D nanomechanical resonator*

Quantum transducers can transfer quantum information between different systems. Microwave-optical photon conversion is important for future quantum networks to interconnect remote superconducting quantum computers with optical fibers. Thanks to the small mass of 2D materials, a 2D nanomechanical resonator containing high quality quantum emitters can exhibit very strong coupling strength between the electron states of emitters and the mechanical vibration by striain effect or Stark shift. Such strong coupling enables the fast transfer of quantum states and open the door to many interesting phenomena. Here we demonstrate that a 2D resonator integrated by hBN membranes containing single photon emitters can achieve strong coupling regime between the vibrational mode and the electron state. We further propose that, by integrating such 2D resonator with superconducting circuit, a high-speed quantum state transfer can be realized from a microwave photon and an optical photon.